How to set ',' as decimal separator with R

Question

Even though my Windows 7 locale settings specify using \",\" as a decimal separator, R and RStudio give me a \".\" separator. Is there any way to change this? Note the \"LC_

Answer 1

Based on the fact that you want to use it with (Pandoc) markdown as far as I can see from the blog comment where you referenced this question, I would also suggest to give a try to my pander package:

> library(pander)
> panderOptions('decimal.mark', ',')
> panderOptions('table.split.table', Inf)
> pander(head(iris))

-------------------------------------------------------------------
 Sepal.Length   Sepal.Width   Petal.Length   Petal.Width   Species 
-------------- ------------- -------------- ------------- ---------
     5,1            3,5           1,4            0,2       setosa  

     4,9             3            1,4            0,2       setosa  

     4,7            3,2           1,3            0,2       setosa  

     4,6            3,1           1,5            0,2       setosa  

      5             3,6           1,4            0,2       setosa  

     5,4            3,9           1,7            0,4       setosa  
-------------------------------------------------------------------

Or PHP Markdown Extra syntax for easier usage with knitr:

> pandoc.table(head(iris), style = 'rmarkdown')


|  Sepal.Length  |  Sepal.Width  |  Petal.Length  |  Petal.Width  |  Species  |
|:--------------:|:-------------:|:--------------:|:-------------:|:---------:|
|      5,1       |      3,5      |      1,4       |      0,2      |  setosa   |
|      4,9       |       3       |      1,4       |      0,2      |  setosa   |
|      4,7       |      3,2      |      1,3       |      0,2      |  setosa   |
|      4,6       |      3,1      |      1,5       |      0,2      |  setosa   |
|       5        |      3,6      |      1,4       |      0,2      |  setosa   |
|      5,4       |      3,9      |      1,7       |      0,4      |  setosa   |

Answer 2

The decimal separator used by the read.table and write.table functions (and most of their cousins) is set with "dec" parameter. read.csv2 is a special case where the default for dec is "," and the field separator ("sep") is set to ";".

You can change the output from R printing, plotting and the actions of the as.character function. You change it from its default with:

 options(OutDec= ",")   # read ?options
 print( pi )
 #[1] 3,141593
 options(OutDec= ",")  # restore default value

This will NOT cause R to handle numeric input from the console differently. That is hard-coded to "." as the decimal separator.

If you applied a text function to a table object, you would be possibly coercing from a 'numeric' to a 'character' mode, since table objects in R inherit from the "matrix" class.

Answer 3

Why do you want to use "," as decimal separator, in that case how R will interprate this R expression

x <- c(2,3) # (two vectors or one). 

So, I assume that you just want to override the default decimal separator to print an output and in this case, I think prettyNum is the right tool.

require(plyr)
head(numcolwise(prettyNum)(iris, dec = ","))

##   Sepal.Length Sepal.Width Petal.Length Petal.Width
## 1          5,1         3,5          1,4         0,2
## 2          4,9           3          1,4         0,2
## 3          4,7         3,2          1,3         0,2
## 4          4,6         3,1          1,5         0,2
## 5            5         3,6          1,4         0,2
## 6          5,4         3,9          1,7         0,4